Question

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Part B: Describe how you can make the line of best fit. Write the approximate slope and y-intercept of the line of best fit. Show your work, including the points that you use to calculate slope and y-intercept. (5 points)

Answer 1

Answer:

approx. m=-0.467, approx. b= 12.33

Step-by-step explanation:

** I would recommend you to plug all the points into your TI-nspire and let it give the estimate, but we can also do it by hand I suppose

I would pick (5,10) and (20,3) since they are closest to the geometric center of the upper and bottom part

so let the best-fit line be Number of sweaters Sold = m*T + b

Sub (5,10) and (20,3) into the equation, we get

$\left \{ {{5m+b=10} \atop {20m+b=3}} \right.$    => 15m = -7 => m=-7/15 = -0.467

Sub (5,10) back in, we get 5*(-7/15) +b =10 => b= 37/3 = 12.33